fix implementation to return embedding (microsoft#805)

calling the memory record's embedding property throws
`RecursionError: maximum recursion depth exceeded`

return the attribute instead of the property

Signed-off-by: hsm207 <[email protected]>

Author: hsm207

python/semantic_kernel/memory/memory_record.py

@@ -50,7 +50,7 @@ def __init__(
 
     @property
     def embedding(self) -> ndarray:
-        return self.embedding
+        return self._embedding
 
     @staticmethod
     def reference_record(